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GB/T 70.2-2015 PDF in English


GB/T 70.2-2015 (GB/T70.2-2015, GBT 70.2-2015, GBT70.2-2015)
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GB/T 70.2-2015: PDF in English (GBT 70.2-2015)

GB/T 70.2-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 70.2-2008
Hexagon Socket Button Head Screws
(ISO 7380-1.2011, Button Head Screws –
Part 1. Hexagon Socket Button Head Screws, MOD)
内六角平圆头螺钉
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. JANUARY 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Dimension ... 6
4 Technical Conditions and Reference Standards ... 9
5 Markings ... 11
Foreword
The serial national standards of GB/T 70 “Internal Wrenching Screws (Hexagon
Socket Part)” include.
--- GB/T 70.1 Hexagon Socket Head Cap Screws;
--- GB/T 70.2 Hexagon Socket Button Head Screws;
--- GB/T 70.3 Hexagon Socket Countersunk Head Screws;
--- GB/T 70.4 Hexagon Socket Button Head Screws with Collar;
--- GB/T 5281 Hexagon Socket Head Shoulder Screws.
This Part belongs to Part 2 of GB/T 70.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 70.2-2008 Hexagon Socket Button Head Screws; compared
with GB/T 70.2-2008, this Part has the major changes as follows.
--- Determine the screw products specified in this Part belong to “the fastener
products reducing the carrying capacity” (see Chapter 1, Table 2, Table 3);
--- Give “thread length b between coarse ladder solid line and unshaded area” (see
Table 1);
--- Adjust and increase the length specifications of screws; e.g.. the maximum length
specification of M3 is increased from 12mm to 30mm; while M16 is increased
from 50mm to 90mm (see Table 1);
--- Delete the surface oxidation treatment and increase nontreatment to the steel
screws (see Table 2);
--- Increase the stainless-steel screw products (see Chapter 1, Table 2, Table 3);
--- Add “Class 012.9” (see Chapter 1, Table 2, Table 3);
--- Add “when considering the use of Class 012.9/012.9, it shall be cautiously
performed. Fastener manufacturer’s capabilities, service conditions and
tightening methods shall be considered carefully. In addition to surface treatment,
the use environment may also cause the stress corrosion cracks of the fasteners”
(see Note a in Table 2);
--- Add “avoid the electroplating treatment for the Class 012.9/012.9 screws; more
information can refer to GB/T 5267.1” (see Note d in Table 2);
Hexagon Socket Button Head Screws
1 Scope
This Part of GB/T 70 specifies the type and dimension, technical conditions and
markings of hexagon socket button head screws with Thread Specification M3~M16,
Property Class 08.8, 010.9, 012.9, 012.9, A2-70, A2-80, A3-70, A3-80, A4-70, A4-80,
A5-70 and A5-80, Product Grade A, and the carrying capacity is reduced as per Table
3.
This Part is applicable to the hexagon socket button head screws that are screwed into
the internal threads of the machine by using an Allen key.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 2 Fasteners - Ends of Parts with External Thread (GB/T 2-2001, idt ISO
4753.1999)
GB/T 70.5 Gauging of Hexagon Sockets (GB/T 70.5-2008, ISO 23429.2004, IDT)
GB/T 90.1 Fasteners – Acceptance Inspection (GB/T 90.1-2002, idt ISO
3269.2000)
GB/T 90.2 Fasteners – Marking and Packaging
GB/T 193 General Purpose Screw Threads – Diameters and Pitches (GB/T 193-
2003, ISO 261.1998, MOD)
GB/T 1237 Designation System for Fasteners (GB/T 1237-2000, eqv ISO
8991.1986)
GB/T 3098.1 Mechanical Properties of Fasteners - Bolts, Screws and Studs (GB/T
3098.1-2010, ISO 898-1.2009, MOD)
GB/T 3098.6 Mechanical Properties of Fasteners - Stainless Steel Bolts, Screws
and Studs (GB/T 3098.6-2014, ISO 3506-1.2009, MOD)
GB/T 3103.1 Tolerances for Fasteners – Bolts, Screws and Nuts (GB/T 3103.1-
2002, ISO 4759-1.2000, IDT)
GB/T 5267.1 Fasteners – Electroplated Coatings (GB/T 5267.1-2002, ISO
4042.1999, IDT)
GB/T 5267.2 Fasteners – Non-Electrolytically Applied Zinc Flake Coatings (GB/T
5267.2-2002, ISO 10683.2000, IDT)
GB/T 5267.4 Passivation of Corrosion-Resistant Stainless-Steel Fasteners (GB/T
5267.4-2009, ISO 16048.2003, IDT)
GB/T 5276 Fasteners - Bolts, Screws, Studs and Nuts - Symbols and Descriptions
of Dimensions (GB/T 5276-1985, eqv ISO 225.1983)
GB/T 5779.1 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for
General Requirements (GB/T 5779.1-2000, idt ISO 6157-1.1988)
GB/T 5779.3 Fasteners - Surface Discontinuities - Bolts, Screws and Studs for
Special Requirements (GB/T 5779.3-2000, idt ISO 6157-3.1988)
GB/T 9145 General Purpose Metric Screw Threads - Limits of Sizes for the Screw
Threads of Medium Quality and Preferable Plan (GB/T 9145-2003, ISO 965-
2.1998, MOD)
GB/T 16938 Fasteners – General Requirements for Bolts, Screws, Studs and Nuts
(GB/T 16938-2008, ISO 8992.2005, IDT)
3 Dimension
The types and dimensions of screws can refer to Figure 1 and Table 1.
The dimension codes and markings shall conform to the provisions of GB/T 5276.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.